Study On Standard Feeding Technology Of Monopterus Albus

The rice field eel, Monopterus albus is not only a kind of delicious food, but also have some medicinal value. It is one of the important freshwater fish, and has became a ·major farming fish in the middle reaches of the Yangtze River. However, the development of eel farming is uneven, and culture technology is relative secrecy. It has high risk because of no perfect breeding system, that restricts the development of eel industry economic. Currently, eel cage aquaculture technology expanded rapidly to become the main part of the industry. Many scholars studied on feeding, water quality regulation, disease prevention and control and other aspects of eel aquaculture, but did not report standardized farming.In order to explore the eel standardized breeding mode, the test from the start eel feeding technology, standardized research eel feeding mode. In order to explore the eel standardized breeding mode, this experiment studied on eel feeding technology to establish a standardized eel feeding mode. This experiment studied the effects of growth, feeding, the survival rate and nutritional diseases by different ratio of the earthworm and formula feed, feeding rates and periodic starvation-feeding on Monopterus albus. The main results were as follows:(1) Different ratio of the earthworm and formula feed:In order to determine the best addition of formula feed, the present study was conducted on rice field eel. which body weight (23.68±1.66) g, body length (28.67±0.56) cm, fed everyday by the ratio of the earthworm and formula feed 4:1,3:1,2:1,1:1,1:2,1:3 and 1:4. The control animal was fed by earthworm only. The growth, feeding, survival rate and other indexes was measured after 56d. The groups 4:1 and 3:1, which body weight 65.79g and 65.30g, were significantly higher than the control animal. The growth rate and specific growth rate of group 4:1 were significantly higher than the control animal. The growth rate of group 3:1 was also significantly higher than the control animal, but there were no significant differences in the specific growth rate. The growth rates and specific growth rates of other experimental groups were significantly lower than the control animal. The hepatosomatic indexes of Monopterus albus were increased significantly which groups of 4:1,3:1,2:1, 1:1, and 1:2 were significantly higher than the control animal while groups 1:3 and 1:4 were significantly lower after feeding 56d. There were no significant differences between groups 1:3 and 1:4 groups. There was a tendency to raise of the survival rates until the max 97.22% (group 2:1) which significantly higher than the other experimental groups and control animal and then declined. Economic benefit analysis showed that the 2:1 group was the highest, reaching 94.2 yuan/box. The results showed that the optimal proportion of earthworms and formula feed was 2:1,4:1 group was the second.(2) Feeding rate:The experiment was a 56d growth trial with 5%,8%,10%,12%, 15% and 20% of the body weight feeding Monopterus albus to screening the best feeding rate. The results showed that the weight gain rate and the specific growth rate of Monopterus albus were increased following by the feeding rates.There were no significant differences on body weight while the specific growth rate significantly increased when the feeding rate below 10%. When the feeding rate was more than 10%. the weight gain rate raised significantly. The specific growth rate tended to be stable. The survival rate of 8% group was,92.22%, the highest, while the 20% group was,57.22%, significantly lower than other groups. The hepatosomatic index was increased along with the feeding rates. Economic benefit analysis showed that the 12% group earned the highest profit. These results suggested that 12% of the body weight of Monopterus albus was the best feeding rate.(3) Intermittent feed-deprivation:This experiment was carried out investigate the effects of intermittent food-deprivation on growth in the rice field eel. A 56d growth trial with five feeding regimes were deprived of food for days and then followed by satiation re-feeding (i:e. S1F6, S2F5,S3F4, S1F2 and S1F1 groups). The fish fed to satiation daily throughout the experiment served as the control group (i.e.S0). The results showed that the final body weights of the experiment groups were significantly lower than SO except S1F6 group which had no significant difference with S0 and put up full compensation growth. The growth rate of S0,146.78%, was the highest. There were no significant differences between S1F6 group and the control fish in weight gain rate and the specific growth rate. The specific growth rate of S1F1 group was the highest, significantly higher than the other groups. The survival rates of S1F6 and S1F1 groups were 82.22% and 86.11%, significantly higher than the other groups. The hepatosomatic index of S0 group was 7.09%, significantly higher than other groups. S1F6 and S2F5 groups were the second and had no significant difference. Economic benefit analysis showed that S1F6 group reaped 2580.06g, more than double of the S2F5, S3F4 and S1F2 groups, earned 63.0 yuan/box. S1F1 group was the second and SO group was the third. The results showed that the S1F6 group was the best feeding mode. The S1F1 group had the highest specific growth rate, had the potential to develop and utilize.